Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89c3258c6ba3429…

MALICIOUS

PDF

68.5 KB Created: 2021-09-30 20:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9de1ce19c477a98a0c4f9b87a62c3a1c SHA-1: 3eb6285a4a619cf6d333bfae4d993de6ab97b533 SHA-256: a89c3258c6ba34298be1a16813568a5b4ed0a9ca48abc040a3b110527a388ae4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised CMS platforms. The primary attack pattern observed is the use of a malicious document to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irish-setter-zucht.info/ckfinder/userfiles/files/suninefikuruvugubijagap.pdf In PDF document text
    • http://bhk-aindling.com/userfiles/files/peputosalexobopepuximo.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/roxukoworekirafowutizanaz.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/83194823478.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139ead834ed7---lasejigamujeridipozirewik.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132160fb7284---vefitegedigavutalokunos.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/14725162839.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50172992969.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/tekones.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/3741063373.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/mopotafamojujilejem.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/rodeguso.pdfIn PDF document text
    • https://mlspoland.co/files/file/24738043251.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26000049695.pdfIn PDF document text
    • http://lilcash.com/ckfinder/userfiles/files/1744349107.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/viroji.pdfIn PDF document text
    • http://brukbet.com/user_images/file/werafonitotubegogiwekuluk.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/71852823204.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/bezudofadefuwid.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/virujoru.pdfIn PDF document text
    • https://777mto.net/contents/files/2986294008.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494d0b5601a---20767897165.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/28377991966.pdfIn PDF document text
    • http://premo.at/userfiles/file/laluwituvavigaregagitoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ultimate+dynamic+navbar+litePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEEC 14784 bytes
SHA-256: c3c53641bbb005fca7438fa2fbe61ed96a1d60285f5cd62c4d1dd90502093345
font_01_sfnt_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 10572 bytes
SHA-256: 0469f70afde24707520da4e82b5087c528800fe28dea68155a544cf3507da8fa

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